Siliken SE3.3Ni, User Manual

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Introduction
8
1.1 General
The SE Inverters product family is a series of grid-connected photovoltaic inverters with FLEX-MPPTs that is a method for flexible MPPTs
management. SE inverters utilize the FLEX-MPPTs technology to efficiently absorb more energy from the PV panels. The SE Inverter is
designed to convert DC power produced by photovoltaic arrays to AC voltage that is then fed into the 230V/50Hz or 230V/60Hz mains utility.
The SE family currently contains three (3) members which are SE4.6NI, SE3.8NI and SE3.3NI. The overview of the grid-tied solar energy
system with a three (3) panel strings inverter is shown in Figure 1.1.1. SE inverters comply with all VDEW (Association of German Electricity
Producers) regulations for supplementary grid feeding to low voltage electricity grid of the utility. Additionally, SE inverters are also certified to
comply with the latest regulations of the DIN VDE 0126-1-1 and the according harmonized standards and the low voltage regulations described
in the CE declaration.
The SE inverter is designed to support up to three (3) PV strings and operate automatically without any configuration once it is installed and
commissioned according to the technical specifications. When at least one of the DC input voltages generated by the photovoltaic module
goes above the minimum MPP voltage setting and under the pre-set threshold value, the embedded controller is then waked up and goes
through the system check mode and then stay at monitoring mode because the pre-set threshold value is not reached yet. At this time, the
SE inverter would not feed the AC power to the mains utility; instead, it keeps watching the input DC voltage. Once the input DC voltage goes
up above the pre-set threshold value and all other conditions necessary for grid connection are checked and fulfilled for a certain period of
time, the SE inverter goes into the grid feeding mode that turns the AC relays on and begins feeding the AC voltage into the grid steadily. When
all of the input DC voltages fall below the minimum MPP voltage setting which is 100Vdc, the SE inverter will then shut itself down. The SE
inverter will be waked up automatically when one or more of the input DC voltages go up above the minimum MPP voltage setting.
It is very much appreciated that you choose Siliken SE inverters as your power conversion devices in the solar power system. This document
contains the information you need for the installation and settings of the SE inverters. Therefore, it is strongly recommended to read this manual
carefully before the SE inverter installations and settings.
user’s manual inverter SE3.3Ni - SE3.8Ni - SE4.6Ni